Across
- 3. Single-celled organisms; some are helpful and some cause disease
- 6. A tool scientists use to see very small organisms
- 7. A living thing so tiny it can only be seen with a microscope
- 8. Scientist who showed that germs are in the air and on hands
- 12. Organisms like mold and yeast that can sometimes cause infections
- 13. The idea that diseases are caused by microorganisms
- 16. An important hygiene habit that helps stop the spread of germs
- 17. A living cell that a virus invades and uses to make more viruses
- 19. The body’s first barrier that keeps many germs out
- 20. Parasites that can live inside the body and cause illness
Down
- 1. A germ that causes disease
- 2. A shot or spray with weakened germs that helps prevent disease
- 4. Cells that attack and destroy invading pathogens
- 5. The body’s ability to fight off disease
- 9. Special proteins made by the body to fight germs
- 10. Mostly single-celled organisms that often live in water and can cause disease
- 11. A medicine used to kill bacteria
- 14. Clean habits that help prevent sickness
- 15. Scientist who showed that specific germs cause specific diseases
- 18. A tiny particle that must enter a living cell to reproduce